Codex vs Gemini Code Assist: Side-by-Side Comparison 2026
Codex vs Gemini Code Assist comparison 2026. Side-by-side features, pricing & capabilities.
| Feature | Codex | Gemini Code Assist |
|---|---|---|
| Category | Agent | Extension |
| Starting Price | Free | Free |
| Model Family | GPT / Codex | Gemini |
| Context Window | 400K | 2M |
| Code Completion | ✓ | ✓ |
| Chat | ✓ | ✓ |
| Inline Editing | ✓ | ✓ |
| Agentic Mode | ✓ | ✗ |
| Multi-File Editing | ✓ | ✗ |
| Terminal Commands | ✓ | ✗ |
| Browser Use | ✗ | ✗ |
| Test Generation | ✓ | ✓ |
| Debugging | ✓ | ✓ |
| Refactoring | ✓ | ✓ |
| Code Review | ✓ | ✓ |
| PR Review | ✓ | ✗ |
| Documentation | ✓ | ✓ |
| Image to Code | ✗ | ✗ |
| Voice Input | ✗ | ✗ |
| App Generation | ✓ | ✗ |
| Deployment | ✗ | ✗ |
| Git Integration | ✓ | ✓ |
| Supported IDEs | Codex App, VS Code, CLI | VS Code, JetBrains, Android Studio, Cloud Shell, Cloud Workstations |
| Open Source | Yes (CLI) | No |
Pricing verified 2026-02-05. Codex pricing | Gemini Code Assist pricing
Overview
Codex is ai agent from OpenAI. Gemini Code Assist is editor extension from Google. Both tools are actively maintained as of 2026.
Codex: What You Get
Codex — AI Coding Agent from OpenAI. App / CLI / IDE.
- Code completions
- AI chat
- Agentic mode
- Multi-file editing
- Terminal commands
- Test generation
- Debugging
- Code review
- Git integration
- App generation
Pricing: Free / $8/mo. 6 plans available.
Models: GPT-5.3-Codex, Codex-mini-latest
Gemini Code Assist: What You Get
Google's AI-powered coding assistant built on Gemini. Provides code completions, chat, code transformations, and full codebase awareness in VS Code and JetBrains IDEs.
- Code completions
- AI chat
- Code transformations
- Codebase awareness
- Pull request summaries
- Google Cloud integration
Pricing: Free / $19/mo. 4 plans available.
Models: Gemini 2.5 Pro
Key Differences
- Category: Codex is ai agent, Gemini Code Assist is editor extension.
- Agentic mode: Codex supports agentic mode; Gemini Code Assist does not.
- Model family: Codex uses GPT / Codex; Gemini Code Assist uses Gemini.
Which Should You Choose?
Choose Codex if you want Codex handles multi-step tasks independently. Choose Gemini Code Assist if you want Deep integration with Google Cloud services and infrastructure. Both tools are strong options — the right choice depends on your workflow and priorities.
Stay in the loop
Get weekly insights on the best AI coding tools, tips, and tutorials.
Newsletter coming soon. Unsubscribe anytime.